CN108693091A - A kind of sludge concentration monitoring system based on cloud platform - Google Patents

A kind of sludge concentration monitoring system based on cloud platform Download PDF

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Publication number
CN108693091A
CN108693091A CN201810699341.0A CN201810699341A CN108693091A CN 108693091 A CN108693091 A CN 108693091A CN 201810699341 A CN201810699341 A CN 201810699341A CN 108693091 A CN108693091 A CN 108693091A
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circuit
module
resistance
capacitance
sludge concentration
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CN201810699341.0A
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Chinese (zh)
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钱国东
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Wuxi Thick Hair Automation Equipment Co Ltd
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Wuxi Thick Hair Automation Equipment Co Ltd
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Priority to CN201810699341.0A priority Critical patent/CN108693091A/en
Publication of CN108693091A publication Critical patent/CN108693091A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06Investigating concentration of particle suspensions

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The sludge concentration monitoring system based on cloud platform that the invention discloses a kind of, including sludge concentration detection device and monitoring center connected to it;The sludge concentration detection device includes sequentially connected ultrasonic sensor, power amplification circuit, ultrasonic transducer, AD conversion unit, micro controller module, and data storage cell, display unit, alarm unit and the communication unit being connect with micro controller module;The ultrasonic sensor includes ultrasonic wave transmitting circuit and ultrasonic wave receiving circuit, the micro controller module includes computing unit, parameter comparison unit, control unit, the ultrasound wave transmitting circuit includes sequentially connected oscillator, constant current radiating circuit and ultrasonic wave transmitting probe, the ultrasonic wave receiving circuit includes that sequentially connected ultrasonic wave receives head, amplifying circuit and shaping circuit, can be accurately monitored to sludge concentration.

Description

A kind of sludge concentration monitoring system based on cloud platform
Technical field
The invention belongs to automatic detection field more particularly to a kind of sludge concentration monitoring systems based on cloud platform.
Background technology
Suspension concentration is a running important process control parameter such as water supply plant, sewage plant.Traditional manually takes Sample chemical drying analysis method, efficiency is low, measurement period is long, it is difficult to play a role in technology controlling and process.For this purpose, being developed Sludge concentration measuring instrument based on optical method, ray method, vibratory drilling method, supercritical ultrasonics technology, especially ultrasonic attenuation method are dirty Mud concentration measuring apparatus is in sewage treatment field using more.Since changes in environmental conditions is big in practical application, it is tested sludge temperature The reasons such as variation range is wider, existing sludge concentration measuring instrument are difficult to obtain satisfied measurement accuracy.Portable supersonic Sludge meter can improve measurement accuracy surely by measuring advance rower, and real time on-line monitoring with ultrasonic sludge densimeter then It is difficult to frequently manually demarcated, therefore measurement error is larger, it is difficult to it plays a role.
In the production divisions such as chemical industry, medicine, grain and oil, coal mine fully-mechanized mining, there is the largely raw material in solution state, centre Product and final product.The method that many Chemical Manufactures still use gap sampling, chemistry titration makees concentration analysis, this side Method needs manual sampling and range estimation to read, therefore need to use the strength of fluid essence for being lot more time to obtain a result, and detecting It spends low.Ultrasonic wave is pollution-free, noiseless, will not cause any harmful effect to environment, be propagated in the liquid of various concentration The velocity of sound is different, therefore ultrasonic wave can be utilized to realize the on-line checking to strength of fluid.But a key factor is temperature pair The velocity of sound has large effect, will directly affect the measurement accuracy of strength of fluid.In order to overcome shadow of the temperature to measurement accuracy It rings, mostly uses the method that is directly compared to the data under different temperatures at present to reduce measurement error, however, this method Not only data-storing amount is big, and calculating process is complicated, and cannot establish the correspondence of the velocity of sound and temperature, normal to external interference Constant error is surveyed and cannot be excluded.
Such as application No. is the ultrasonic flows of " 201280049417.6 " and concentration to share measuring system, including:It sends With ultrasonic sensor, it is attached to the outer wall for the pipeline that measurement object fluid flows through and sends ultrasonic wave through wall surface;Concentration is surveyed Amount ultrasonic sensor receives the ultrasonic wave that above-mentioned transmission ultrasonic sensor is sent through measurement object fluid line; Flow measurement ultrasonic sensor receives the ultrasonic wave that above-mentioned transmission ultrasonic sensor is sent by intervals; Integrated signal processing unit is received according to above-mentioned measurement of concetration ultrasonic sensor and flow measurement ultrasonic sensor Ultrasonic intensity measurement is swum concentration/total amount of solids, and the middle passing time difference measurements flow that utilizes the medium.Therefore, the hair It is bright using can simultaneously in the flow of measurement processing water, processing water the concentration for the solids that swims and the sensor of total amount and sensor The device of densimeter and flow meter function is integrated in setting structure exploitation, to realize determining for the sludge as water treatment technology product Buret is managed, moreover, by being controlled according to the subsequent technique of SS total amounts and optimum load being selected to greatly improve water treatment technology Efficiency can be saved manpower expense, converted from the passive technology controlling and process of the prior art by the i.e. controllable technique of an administrator It is controlled for active process.
For another example application No. is a kind of " 201310149165.0 " universal ultrasonic liquid concentration detection method and device, It is different in the velocity of sound of different Propagations using ultrasonic wave, according to known sound path to being surveyed when sound in fluid to be measured Amount, and measured value is modified using real-time temperature values, to obtain the percentage of the different solutes contained in different solvents Than.The invention carries out the sampling of ultrasonic propagation velocity for different solvents and solute in different temperature spots, is tied according to sampling Fruit solves the ultrasonic wave velocity of sound and temperature and correspondence formula of concentration in the solution, is measured strength of fluid to realize Versatility.The present invention can also pass through the measurement of the velocity of sound in measurement to the velocity of sound in air in laboratory environment and pure water simultaneously To realize the correction to system hardware error and sound path error, raising measurement accuracy.
Invention content
The technical problem to be solved by the present invention is to provide a kind of dirt based on cloud platform for the deficiency of background technology Mud concentration monitoring system can accurately measure sludge concentration and then handle in time it.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of sludge concentration monitoring system based on cloud platform, including Cloud Server terminal, monitor terminal, and be arranged in motor On data collection station, the data collection station and monitor terminal are connect with Cloud Server terminal respectively;The data are adopted It includes array of ultrasonic sensors, multiplexer switch, power amplification circuit, ultrasonic transducer, analog-to-digital conversion list to collect terminal Member, amplifier circuit unit, rectification filtering unit, micro controller module, data storage cell, clock module, display module, alarm Module, data transmission module, power module;The array of ultrasonic sensors passes sequentially through multiplexer switch, power amplification Circuit, ultrasonic transducer, AD conversion unit, amplifier circuit unit, rectification filtering unit connect micro controller module, described Data storage cell, clock module, display module, alarm module, data transmission module, power module respectively with microcontroller mould Block connects;The rectification filtering unit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th Resistance, the 7th resistance, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, operational amplifier, power supply core Piece, one end of the first resistor are connected with the output end of three-stage amplifier, the other end connection first of the first resistor It is connected with one end of second resistance behind one end of capacitance and one end of the second capacitance, the other end of first capacitance connects third It is connected with the negative input end of operational amplifier behind one end of resistance, the other end of second capacitance connects the another of 3rd resistor It is connected with the output end of operational amplifier behind end, the other end ground connection of the second resistance;The positive input of the operational amplifier End is grounded after being sequentially connected the 4th resistance and the 5th resistance, and the positive power source terminal of operational amplifier is separately connected one end of third capacitance It is connected with the anode of power supply with the other end of one end of the 6th resistance, the 6th resistance, another termination of the third capacitance Ground, the negative power end of operational amplifier are separately connected one end of one end and the 4th capacitance of the 7th resistance, the 7th resistance The other end is connected with the cathode of power supply chip, the other end ground connection of the 4th capacitance;The output end string of the operational amplifier It is connect with the input terminal of micro controller module after connecing the 5th capacitance.
As a kind of further preferred scheme of the sludge concentration monitoring system based on cloud platform of the present invention, the ultrasonic wave Radiating circuit includes sequentially connected oscillator, constant current radiating circuit and ultrasonic wave transmitting probe, the ultrasonic wave receiving circuit Including sequentially connected ultrasonic wave receives head, amplification and rectification circuit;The shaping circuit include summing amplifier, protection circuit, DC level extracts circuit, reference level automatic adjusument circuit and compares shaping circuit, the summing amplifier and protection electricity The output end on road is separately connected the input terminal of DC level extraction circuit, and the output end of the DC level extraction circuit connects respectively It connects reference level automatic adjusument circuit and compares the input terminal of shaping circuit.
As a kind of further preferred scheme of the sludge concentration monitoring system based on cloud platform of the present invention, the cloud service Device terminal includes that main controller module and data transmit-receive module connected to it, data memory module, clock module and USB connect Mouthful.
As a kind of further preferred scheme of the sludge concentration monitoring system based on cloud platform of the present invention, the ultrasonic wave Receiving circuit uses logafier.
As a kind of further preferred scheme of the sludge concentration monitoring system based on cloud platform of the present invention, the microcontroller Device module uses AVR series monolithics.
As a kind of further preferred scheme of the sludge concentration monitoring system based on cloud platform of the present invention, the display mould Block is LCD display.
The present invention has the following technical effects using above technical scheme is compared with the prior art:
1, the present invention has stronger interference free performance, can accurately obtain coherent detection data, and by microprocessor into Row analysis and operation obtain suspension particle concentration;It uses monitoring ultrasonic method, with stronger interference free performance, energy Related monitoring data are enough accurately obtained, and analysis and operation are carried out by microprocessor and obtain sludge concentration, the sludge concentration The test result of microprocessor monitoring center is timely and effectively transmitted to by 3G communication modules to be analyzed and made accordingly Decision, continuously the dynamic change of sludge concentration is monitored in real time comprehensively.
Description of the drawings
Fig. 1 is the structure principle chart of the present invention;
Fig. 2 is data collection station structure principle chart of the present invention;
Fig. 3 is rectification filtering unit circuit diagram.
Specific implementation mode
Technical scheme of the present invention is described in further detail below in conjunction with the accompanying drawings:
A kind of sludge concentration monitoring system based on cloud platform, as shown in Figure 1, comprising Cloud Server terminal, monitor terminal, and The data collection station being arranged on motor, the data collection station and monitor terminal are connect with Cloud Server terminal respectively;
As described in Figure 2, the data collection station include array of ultrasonic sensors, multiplexer switch, power amplification circuit, Ultrasonic transducer, AD conversion unit, amplifier circuit unit, rectification filtering unit, micro controller module, data storage are single Member, clock module, display module, alarm module, data transmission module, power module;The array of ultrasonic sensors is successively Pass through multiplexer switch, power amplification circuit, ultrasonic transducer, AD conversion unit, amplifier circuit unit, rectifying and wave-filtering Unit connects micro controller module, the data storage cell, clock module, display module, alarm module, data transmission mould Block, power module are connect with micro controller module respectively;As shown in figure 3, the rectification filtering unit includes first resistor, second Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first capacitance, the second capacitance, third capacitance, 4th capacitance, the 5th capacitance, operational amplifier, power supply chip, one end of the first resistor and the output of three-stage amplifier End is connected, and the other end of the first resistor connects one with second resistance behind one end of the first capacitance and one end of the second capacitance End is connected, and is connected with the negative input end of operational amplifier behind one end of the other end connection 3rd resistor of first capacitance, institute It is connected with the output end of operational amplifier after stating the other end of the other end connection 3rd resistor of the second capacitance, the second resistance The other end ground connection;The positive input terminal of the operational amplifier is grounded after being sequentially connected the 4th resistance and the 5th resistance, and operation is put The positive power source terminal of big device is separately connected one end of one end and the 6th resistance of third capacitance, the other end and the electricity of the 6th resistance The anode in source is connected, and the other end ground connection of the third capacitance, the negative power end of operational amplifier is separately connected the 7th resistance The other end of one end of one end and the 4th capacitance, the 7th resistance is connected with the cathode of power supply chip, the 4th capacitance The other end is grounded;The output end of the operational amplifier is connect after concatenating the 5th capacitance with the input terminal of micro controller module.
The ultrasound wave transmitting circuit includes sequentially connected oscillator, constant current radiating circuit and ultrasonic wave transmitting probe, The ultrasonic wave receiving circuit includes that sequentially connected ultrasonic wave receives head, amplification and rectification circuit;The shaping circuit includes asking Circuit, reference level automatic adjusument circuit are extracted with amplifier, protection circuit, DC level and compare shaping circuit, it is described The output end of summing amplifier and protection circuit is separately connected the input terminal of DC level extraction circuit, the DC level extraction The output end of circuit is separately connected reference level automatic adjusument circuit and compares the input terminal of shaping circuit.
The Cloud Server terminal includes that main controller module and data transmit-receive module connected to it, data store mould Block, clock module and USB interface.
The ultrasonic wave receiving circuit uses logafier.
The micro controller module uses AVR series monolithics.
The display module is LCD display;
Ultrasonic wave transmitting circuit, for generating ultrasonic pulse string;
Power amplification circuit, for ultrasonic pulse string to be filtered and amplified;
Ultrasonic transducer, for amplified ultrasonic pulse string to be converted into electric signal;
Ultrasonic wave receiving circuit, the electric signal for being generated to ultrasonic transducer carry out logarithmic amplification;
AD conversion unit, for digital electric signal will to be converted to amplified analog electrical signal;
Micro controller module, for according to the digital electric signal received, suspension particle to be calculated using ax=(lnE0-lnEx)/L Attenuation rate obtains sludge concentration in turn by demarcating concentration with voltage attenuation curve;Wherein, ax is suspended particles attenuation rate, E0 For initial receiving voltage, Ex is receiving voltage, and L is ultrasonic the distance between wave transmitting circuit and ultrasonic wave receiving circuit;
Parameter comparison unit, for comparing the calculated sludge concentration of computing unit with setting value, if sludge concentration is super Setting value is crossed, then sends a signal to control unit;
Control unit, the signal control alarm unit for being sent according to the parameter comparison unit received send out alarm, simultaneously Sludge concentration is sent to monitoring center by communication unit;
Display unit is used for the calculated sludge concentration of real-time display micro controller module;
Data storage cell is used for the calculated sludge concentration of real-time storage computing unit.
Wherein, the ultrasonic wave transmitting circuit uses DDS, and the ultrasonic wave receiving circuit uses logafier, described It is LCD display that micro controller module, which uses AVR series monolithics, the display unit,.
Direct Digital Frequency Synthesizers (DDS) carry out frequency synthesis with the concept of " phase ", can not only generate different frequencies The sine wave of rate, and the initial phase of waveform can be controlled, triangular wave and square wave can also be generated.This system uses DDS Impulse generators of the AD9833 as ultrasonic transmitting element.AD9833 is programmable, passes through High Speed Serial peripheral interface (SPI), it is only necessary to which an external clock goes generation simple sinusoidal wave that can work.AD9833 can be in the clock based on 25 MHz The lower waveform for generating the MHz of 0 Hz~12.5.
The pulse generation circuit of ultrasonic wave transmitting circuit.The clock source of DDS has source crystal oscillator in 25 MHz.AD9833's Spi bus CLK, DATA, CS are connected with the I/O of microprocessor mouths by a piece of 74HC244.74HC244 is eight with phase tri-state Buffer, for enhancing signal carrying load ability.By the control of microprocessor, AD9833 needs frequency in the output of VOUT pins Square wave.The output of AD9833 and the gating signal EN of microcontroller are generated under the action of NAND gate in the output end of NAND gate Train of pulse, this train of pulse can drive ultrasonic transducer by power amplification circuit.
The logafier of ultrasonic echo receiving circuit:In field of signal processing, some signals often have very wide Dynamic range.Such as in the systems such as radar, sonar, dynamic range of signals to be treated is up to 120 dB or more;Ultrasonic wave The voltage of echo receiver front end can also be from " μ V " grade to " V " grade.Wide dynamic range is often given to bring using design and much be asked Topic.
In practical applications, can generally non-linear compression be carried out to signal to be dealt with.Using it is most be exactly logarithm Amplifier.It makes the envelope of output signal and input signal at logarithmic scale.It need not picture to the compression of dynamic range of signals AGC system extracts the level of input signal to control gain like that, and the size of gain and signal is inversely proportional, communication, radar, It has a wide range of applications in ultrasound, electronic countermeasure.
The program uses single ended input, has logarithm zero and slope adjustment circuit, logarithm zero is located at -84dBm, slope It is set to about 20mV/dB.Add first-level buffer (AD8031) after logafier, main function has two:First, making receiving module most Output is low-impedance eventually, improves anti-interference ability;Second is that log slope is restored to 25mV/ by the voltage gain by this level-one dB .The logafier signal input range of design is set to -72dBm, and (in 50 Ω source impedances, -72dBm is equivalent to amplitude For the sine wave of ± 80 μ V)+10dBm (amplitude is the sine wave of ± 1V) is arrived, corresponding logarithm output voltage is 0.3~2.35V, Logarithm dynamic range 82dB.The circuit makes modular form, is encapsulated in shielding case.Institute leaded (ground wire and output signal line Except) drawn by feedthrough capacitor, the outer pole ground connection of feedthrough capacitor, to improve shield effectiveness.
Those skilled in the art of the present technique are it is understood that unless otherwise defined, all terms used herein(Including skill Art term and scientific terminology)With meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Also It should be understood that those terms such as defined in the general dictionary should be understood that with in the context of the prior art The consistent meaning of meaning, and unless defined as here, will not be explained with the meaning of idealization or too formal.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention Within.Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned embodiment party Formula is done under the premise of can also being or else detached from present inventive concept within the knowledge of a person skilled in the art Go out various change.

Claims (6)

1. a kind of sludge concentration monitoring system based on cloud platform, it is characterised in that:Including Cloud Server terminal, monitor terminal, And the data collection station being arranged on motor, the data collection station and monitor terminal connect with Cloud Server terminal respectively It connects;The data collection station includes array of ultrasonic sensors, multiplexer switch, power amplification circuit, ultrasonic wave transducer Device, AD conversion unit, amplifier circuit unit, rectification filtering unit, micro controller module, data storage cell, clock module, Display module, alarm module, data transmission module, power module;The array of ultrasonic sensors passes sequentially through multiplexing Switch, power amplification circuit, ultrasonic transducer, AD conversion unit, amplifier circuit unit, rectification filtering unit connect micro-control Device module processed, the data storage cell, clock module, display module, alarm module, data transmission module, power module point It is not connect with micro controller module;The rectification filtering unit include first resistor, second resistance, 3rd resistor, the 4th resistance, 5th resistance, the 6th resistance, the 7th resistance, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, operation Amplifier, power supply chip, one end of the first resistor are connected with the output end of three-stage amplifier, the first resistor it is another One end connect the first capacitance one end and the second capacitance one end after be connected with one end of second resistance, first capacitance it is another Be connected with the negative input end of operational amplifier behind one end of one end connection 3rd resistor, the other end of second capacitance connects the It is connected with the output end of operational amplifier after the other end of three resistance, the other end ground connection of the second resistance;The operation is put The positive input terminal of big device is grounded after being sequentially connected the 4th resistance and the 5th resistance, and the positive power source terminal of operational amplifier is separately connected the The other end of one end of one end of three capacitances and the 6th resistance, the 6th resistance is connected with the anode of power supply, the third electricity The other end of appearance is grounded, and the negative power end of operational amplifier is separately connected one end of one end and the 4th capacitance of the 7th resistance, institute The other end for stating the 7th resistance is connected with the cathode of power supply chip, the other end ground connection of the 4th capacitance;The operation amplifier The output end of device is connect after concatenating the 5th capacitance with the input terminal of micro controller module.
2. a kind of sludge concentration monitoring system based on cloud platform according to claim 1, it is characterised in that:The ultrasound Wave transmitting circuit includes sequentially connected oscillator, constant current radiating circuit and ultrasonic wave transmitting probe, and the ultrasonic wave receives electricity Road includes that sequentially connected ultrasonic wave receives head, amplification and rectification circuit;The shaping circuit includes summing amplifier, protection electricity Road, DC level extract circuit, reference level automatic adjusument circuit and compare shaping circuit, the summing amplifier and protection The output end of circuit is separately connected the input terminal of DC level extraction circuit, the output end difference of the DC level extraction circuit Connection benchmark Potential adapting adjusts circuit and compares the input terminal of shaping circuit.
3. a kind of sludge concentration monitoring system based on cloud platform according to claim 1, it is characterised in that:The cloud clothes Device terminal of being engaged in includes main controller module and data transmit-receive module connected to it, data memory module, clock module and USB Interface.
4. a kind of sludge concentration monitoring system based on cloud platform according to claim 2, it is characterised in that:The ultrasound Wave receiving circuit uses logafier.
5. a kind of sludge concentration monitoring system based on cloud platform according to claim 1, it is characterised in that:The micro-control Device module processed uses AVR series monolithics.
6. a kind of sludge concentration monitoring system based on cloud platform according to claim 1, it is characterised in that:The display Module is LCD display.
CN201810699341.0A 2018-06-29 2018-06-29 A kind of sludge concentration monitoring system based on cloud platform Pending CN108693091A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111060353A (en) * 2019-12-31 2020-04-24 西安金清泰环境科技有限公司 Silt sampling dolly
CN114199732A (en) * 2021-12-14 2022-03-18 江苏科德生态环保水处理有限公司 Intelligent sludge settlement ratio detection system
CN115639125A (en) * 2022-12-26 2023-01-24 四川薪火恒创科技有限公司 Sludge concentration detection system and method

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Publication number Priority date Publication date Assignee Title
JPH04318455A (en) * 1991-04-16 1992-11-10 Kaijo Corp Ultrasonic concentration measuring instrument
CN103645246A (en) * 2013-11-16 2014-03-19 中山欧麦克仪器设备有限公司 Ultrasonic sludge concentration online monitoring device
CN104132874A (en) * 2014-08-06 2014-11-05 中山弘博企业管理咨询有限公司 Sludge concentration detection equipment
CN104729967A (en) * 2015-03-31 2015-06-24 无锡市崇安区科技创业服务中心 Ultrasonic-based sludge concentration monitoring system
CN106680369A (en) * 2017-02-23 2017-05-17 天健创新(北京)监测仪表股份有限公司 Ultrasonic mud-water interface measuring device and method

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Publication number Priority date Publication date Assignee Title
JPH04318455A (en) * 1991-04-16 1992-11-10 Kaijo Corp Ultrasonic concentration measuring instrument
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CN104132874A (en) * 2014-08-06 2014-11-05 中山弘博企业管理咨询有限公司 Sludge concentration detection equipment
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111060353A (en) * 2019-12-31 2020-04-24 西安金清泰环境科技有限公司 Silt sampling dolly
CN114199732A (en) * 2021-12-14 2022-03-18 江苏科德生态环保水处理有限公司 Intelligent sludge settlement ratio detection system
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CN115639125B (en) * 2022-12-26 2023-10-20 四川薪火恒创科技有限公司 Sludge concentration detection system and method

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